The present disclosure discloses a lid, including a lid body with a hole; an elastic sleeve having a bore extending therethrough, a part of the elastic sleeve extending through the hole, the elastic sleeve elastically deformable between a torsional state and a non-torsional state; an elastic spout extending through the bore of the elastic sleeve, the elastic spout being open when the elastic sleeve is in the non-torsional state and being deformed to close when the elastic sleeve is in the torsional state; a rotating member configured for twisting the elastic sleeve to the torsional state; a locking member having a locking state for keeping the elastic sleeve in the torsional state, and a releasing state for allowing the elastic sleeve to return to the non-torsional state; and an elastic member interacting with the locking member for driving the locking member to remain in the locking state.